73-87 Chevy _ GMC Trucks > Interior & Equipment

Leak On Cab Floor

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Jon87V20:
I have some kind of water leak and I’m wondering if anyone knows if there’s a place I should start looking first.

I noticed recently the edge of the front driver side floor was soaked right up near the door. However, I didn’t see any signs of where it could be from. Well today I was in there again and this time I spotted a drop or two on the panel just under the hood release handle. I didn’t have time to really investigate yet, but I shined a light up under the dashed and poked my head around. Didn’t see any thing obvious though.

Is this maybe from the windshield and it’s finding it’s way down to the floor?

Next time it’s raining I’ll try and go out and watch it too. I just really don’t want to keep filling up the floor with water.

I’ll put up a photo as soon as I can.

JohnnyPopper:
There are two weep holes or drains on each lower corner of the windshield. They drain to the hollow of the fender between the vent and the outer shell of the fender.

As "Rust never sleeps", it could be finding a way into the inner side of the vent wall.

You could simulate rain to see if you can see where it's coming in.

Worst case will be pulling your windshield... :(

Geezer77GMC:
Leaking clearance & marker lights on the cab roof can let water into your cab.

Jon87V20:

--- Quote from: JohnnyPopper on February 08, 2022, 11:44:45 PM ---There are two weep holes or drains on each lower corner of the windshield. They drain to the hollow of the fender between the vent and the outer shell of the fender.

As "Rust never sleeps", it could be finding a way into the inner side of the vent wall.

You could simulate rain to see if you can see where it's coming in.

Worst case will be pulling your windshield... :(

--- End quote ---

Yeah. Well it's about ready for a windshield anyway. Maybe it's time to pull the trigger on that.

Jon87V20:
So since I posted this, I have pulled out the dash pad and looked really closely at the bottom of the windshield and there's definitely no water there. It seems like it's right at the level of this rubber plug type thing on both the driver side and passenger side on the firewall. Could it be coming in through those for some reason? I can only pull it like halfway out, then it stops and I didn't want to force it to go further. Is it okay to pull those out for inspection purposes? (see photo)

Does anyone have some kind of drawing or diagram of where water is supposed to exit from the cowl and windshield area? If these exits were blocked with pine needles and other junk, where would the water want to go to get out? I know Johnny mentioned the weep holes. However, I just think a rust problem wouldn't make it leak from both sides at once right? As far as I can tell, both sides had this happen simultaneously.

If I have time tomorrow, now that it's all taken apart, I may just lay the hose on the roof and run water down the front. I tried this last month after cleaning a bunch of crap out of the cowl and didn't see any water coming in that was obvious though.

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